Cylinder head and spark plug



Dec. 30,-1'1924.

w. c. KEIM v CYLINDER HEAD AND SPARK PLUG Filed Sept. 12. 1921 Fatented Dec. 30, 1924.

SATES tenant WILLIAM C. KEIM, OF SPRINGFIELD, ILLINOIS.

CYLINDER HEAD AND SPARK PLUG.

Application filed September 12, 1921.

To all whom it may concern:

Be it known that I, l'VILLIAM C. KEIM, a citizen of the United States, residing at Springfield, Illinois, have invented a certain new and useful Improvement in Cylinder Heads and Spark Plugs, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this application,

My invention relates to internal combustion engines and consists in the combination of a novel spark plug and cylinder head as hereinafter described.

The main object of my invention is to eliminate the fouling of spark plug electrodes by the deposit of carbon thereon from the oil present in the engine cylinder. The tendency to the formation of carbon deposit on the spark points in a gasoline engine has prompted the use of many devices to prevent the pumping of oil in the cylinder by the piston. The more successful these. devices may be, the greater the detriment to the lubrication of the cylinder and piston walls, but the latter evil has been considered the lesser and has been suffered because of the necessity of maintaining clean spark points. An additional object of my invention, therefore, is to permit complete lubrication between the cylinder and piston.

I also desire to provide an adequate and novel arrangement of intake and exhaust passages whereby the e tliciency of the engine will be increased.

In the accompanying drawings which illustrate a selected embodiment of my invention,-

Figure l is a vertical section through the cylinder and cylinder head of an internal combustion engine, taken on the line 11 of Figure 2 and showing the piston, the spark plug, and intake valve in elevation.

Figure 2 is a horizontal section of the cylinder head taken on the line 22 of Figure 1.

The engine cylinder 1 is provided with the usual water jacket 2 and with a cylinder head 3. An intake valve 4 is located in one of the side walls of the cylinder and the valve port opens into an intake passage 5 in cylinder head 3. Passage 5 terminates above the center of the top of cylinder 1 and is separated from the latter by a bottom wall Serial No. 500,158.

6 which has an axial opening into the cvlinder. u

A spark plug having a hollow cylindrical shell 7 is positioned in intake passage 5, the shouldered upper end of shell '7 engaging the exterior of the cylinder head and the lower end of shell 7 being screwed into the opening in wall 6 and projecting slightly beyond same into the cylinder. The usual insulator core 8 is positioned in shell 7 and, as clearly shown in Figure 1, is substantially spaced from the walls of the shell throughout the lower portion of the insulator. 7 connecting the interior of the shell with the passage 5 and consequently the spark plug shell serves to connect passage 5 with cylinder 1 and directs the intake charge past the spark plug terminals 9 and 10.

Each intake stroke of the piston 11 will draw a charge of fresh clean fuel through valve 4, passage 5, and shell 7, and past the spark points, cooling the insulator and thoroughly cleansing the same and the points of any carbon which may have been deposited thereon by the explosion of the previous charge. I prefer to make the total area of the openings 7 at least as large as the area of the port of valve 4, so that the passage of the fuel to the interior of the cylinder will not be restricted by the spark plug. The remainder of the spark plug is of the usual construction and it is removable from the cylinder head in the ordinary manner.

An exhaust passage. 12 partially surrounds the intake passage and leads to an exhaust valve 13, located adjacent to intake valve 4. To eliminate the presence of dead gases in the forward portion of intake passage 5, I provide a connection 1-1 in the wall separating the intake and exhaust passages. This connection does not interfere with the intake of the fuel as valves 4 and 14 are opened at different periods.

I am aware that various modifications may be made in the mechanical construction which embodies my invention, and I contemplate such changes in the commercial development of my invention.

I claim:

1. In an internal combustion engine 2. cylinder block having a fuel intake passage therein, an inlet valve in said passage adapted to be positively opened by suitable timing mechanism, a cylinder head having a Shell 7 has a number of openings fuel intake passage formed therein, and a spark. plug located at the end of said head passage and including an apertured shell forming an enclosed continuation of said head passage and directing substantially all of the fuel supplied to its respective cylinder around and past its insulator and ignition points.

2. In an internal combustion engine, a cylinder, a cylinder head, a fuel intake passage in said head opening into the combustion chamber, an exhaust passage in said head partially surrounding the wall of said intake passage and extending alongside of the latter.

3. In an internal combustion engine, a fuel intake passage, an exhaust passage, a spark plug includin a shell located in said intake passage and "orming a portion thereof, and a connection between said intake and exhaust passages.

4. In an internal combustion engine, a cylinder, a cylinder head, a fuel intake passage in said head leading tothe center of the top of said cylinder, an exhaust passage in said head partially surrounding the wall of said intake passage and extending along: side of the latter, and a single restricted connection between said intake and exhaust passages to permit the escape oli exhaust gases trapped in said intake passage.-

In an internal combustion engine, a cylinder, a spark plug including a hollow shell, one end of which opens intosaid cylinder, an intake valve, a passage lead ing from said valve to said plug shell, and openings in. said shell. connecting its interior to said passage and their total area being substantially equal to the area of the port of said valve.

6. In an internal combustion engine, a fuel intake passage, an exhaust passage partially surrounding said intake passage, and a spark plug including a shell locatedin said intake passage and. forming a portion thereof.

7 In an internal combustion engine, a cylinder head, a spark plug therein includa-pertured shell and an insulator surrounded thereby and in part spaced therefrom, a

passageway in" said head for the fuel cliarge' oi' the engine with the end of the passage way Wall contacting with said shell only and delivering fuel to the engine cylinder through said shell, and a valve in said passageway adapted to be positively actuated by the engine.

9. In an internal combustion engine, a head having spaced walls, a fuel intake passage between said walls, and a spark plug seated in one of said walls and extending through the other of said walls into the cylinder.

10. In an internal combustion engine, head having spaced walls, afuel intake passage between said walls, and a spark plug having a shell extending between said walls in said passage and perforated so that its interior is in communication with said passage.

11. In an internal combustion engine, a fuel inlet'f valve, a removable cylinder head, a fuel intake passage in said head, ignition elements, an insulatorenclosing one of said; elements, and a member surrounding saidinsulator and its enclosed ignition element and providing an enclosed continuation of said passage to direct substantially all of the in taken fuel? along said insulator' and associate element before entering the plosion chamber.

Intestimony whereof I hereunto aflin my signature this 9th day of September, 1:921.

winnrnivr e; Knit-it 

